n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 56 |
4 | 221 |
5 | 884 |
6 | 3534 |
7 | 14136 |
8 | 56542 |
9 | 226168 |
10 | 904672 |
11 | 3618688 |
12 | 14474751 |
13 | 57899004 |
14 | 231596014 |
15 | 926384056 |
16 | 3705536222 |
17 | 14822144888 |
18 | 59288579552 |
19 | 237154318208 |
20 | 948617272832 |
21 | 3794469091328 |
22 | 15177876365312 |
23 | 60711505461248 |
[1,4,14,56,221,884,3534,14136,56542,226168,904672, 3618688,14474751,57899004,231596014,926384056, 3705536222,14822144888,59288579552,237154318208, 948617272832,3794469091328,15177876365312, 60711505461248] |